SpringBoot启动时执行自定义内容的五种方法

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class MyCommandLineRunner implements CommandLineRunner {
    
    @Override
    public void run(String... args) throws Exception {
        System.out.println("应用启动后执行 - CommandLineRunner");
        // 可以在这里访问Spring容器中的Bean
    }
}

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

@Component
public class MyApplicationRunner implements ApplicationRunner {
    
    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println("应用启动后执行 - ApplicationRunner");
        // 可以访问命令行参数
        if (args.containsOption("debug")) {
            System.out.println("Debug模式已启用");
        }
    }
}

@Component
@Order(1)  // 数字越小，优先级越高
public class FirstRunner implements CommandLineRunner {
    @Override
    public void run(String... args) {
        System.out.println("第一个Runner执行");
    }
}

@Component
@Order(2)
public class SecondRunner implements CommandLineRunner {
    @Override
    public void run(String... args) {
        System.out.println("第二个Runner执行");
    }
}

import javax.annotation.PostConstruct;
import org.springframework.stereotype.Component;

@Component
public class MyPostConstructBean {
    
    @PostConstruct
    public void init() {
        System.out.println("Bean初始化后执行 - @PostConstruct");
        // 可以在这里执行初始化逻辑
    }
}

import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

@Component
public class MyApplicationListener implements ApplicationListener<ApplicationReadyEvent> {
    
    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        System.out.println("应用完全启动后执行 - ApplicationReadyEvent");
        // 可以在这里执行应用启动后的逻辑
    }
}

import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

@Component
public class MyInitializingBean implements InitializingBean {
    
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("Bean属性设置后执行 - InitializingBean");
        // 可以在这里执行初始化逻辑
    }
}

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        System.out.println("Spring Boot启动前执行");
        
        SpringApplication.run(MyApplication.class, args);
        
        System.out.println("Spring Boot启动过程完成后执行");
        // 注意：这里的代码会在Spring Boot启动后立即执行，但不一定是所有Bean都初始化完成
    }
}